ASTM E1338-2009 计算机化材料特性数据库的金属和合金的识别指南

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【英文标准名称】:GuideforIdentificationofMetalsandAlloysinComputerizedMaterialPropertyDatabases
【原文标准名称】:计算机化材料特性数据库的金属和合金的识别指南
【标准号】:ASTME1338-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:B08.01
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:alloys;computerizeddatabases;computerizedmaterialpropertydatabases;databases;dataelements;metals;Alloys;Computerizedmaterialpropertydatabases;Identification;Metalsandmetallicmaterials
【摘要】:Thisguidedescribesthetypesofinformationthatareindispensableforuniquelyidentifyingametaloralloyinacomputerizeddatabase.Thepurposeistofacilitatestandardizedstorageandretrievaloftheinformationwithacomputer,andallowmeaningfulcomparisonofdatafromdifferentsources.Manynumberingsystemsformetalsandalloyshavebeendevelopedwhicharebasedontheirchemicalcompositions.Separatesystemshavealsoevolvedtodescribethethermomechanicalconditionofmetalsandalloysinordertonarrowtheirdescription.Itistheseparationintologicaldataelementsfromthesecomplex,historicallysignificant,andoverlappingsystemsofidentificationthatisthechallengeintheidentificationofmetalsandalloyswithincomputerizeddatabases.Thisguideisintendedtoprovideacommonstartingpointfordesignersandbuildersofmaterialspropertydatabases.Thisguidegenerallyidentifiesthecontentsofthedatabaseintermsofdataelements,butdoesnotrecommendanyparticularlogicalorphysicaldatabasedesign.Adatabasebuilderhasconsiderableflexibilityindesigningadatabaseschema,anditisintendedthatthisguidesupportthatflexibility.Itisrecognizedthatmaterialpropertydatabaseswillbedesignedfordifferentlevelsofmaterialinformationandfordifferentpurposes.Forexample,adatabasedevelopedbyanindustrytradegroupmightonlyidentifytypicalpropertiesgenerallyrepresentativeofthoseforaparticularmetaloralloy,andnotactualvaluesmeasuredonaspecificsample.Ontheotherhand,abusinessmightdesiretomanagedataonspecificlotsitprocures,orevenpropertiesofaspecificpieceorsamplefromalot.Consequently,someofthedataelementsidentifiedinthisguidemightnotbeapplicableineverydatabaseinstance.Theextentofmaterialidentificationimplementedinaparticulardatabasedependsonitsspecificpurpose.Asingleorganizationmayincludesubstantialdetailinitsdatabase.Lessdetailmaybeincludedinacommondatabaseusedbyseveralorganizationsbecauseofcommercialandotherconsiderations.Sincemetalsandalloysarediverseandthetechnologiesarealwayschanging,recommendationsshouldnotberegardedasexclusiveofadditionaldataelementsformaterialidentification.Therecommendeddataelementsshouldbeexpandedifadditionaldetailedinformationwhichservestoidentifymaterialsistoberecorded.Anumberofdataelementsareconsideredessentialtoanydatabaseandneedtoexistinthedatabase.Dataelementsareconsideredessentialiftheyarerequiredforuserstohavesufficientinformationtointerpretthedataandbeconfidentoftheirabilitytocomparesetsofdataformaterialsfromdifferentsources.Failuretocompleteanessentialdataelementmayrendertherecordunusableinadatabaseorindataexchange.Essentialreferstothequalityorcompletenessofrecordeddata,anddoesnotnecessarilyhavedirectmeaningrelativetodatabasestructure.Insomecases,theidentifieddataelementmightbeaccommodatedwithinaparticulardatabasewithoutexplicitlyincludingafieldjustfortheessentialdataelement.Additionally,adatabaseschemamayrequireadditionaldatafieldstobenotnulltomaintaindatarecordintegrityortoimplementamandatorydatarelationship.Theseadditionalfieldsarebeyondthescopeofthisguide.Finally,itisalsonotedthatadataelementidentifiedasessentialinthisguidemightnotberelevantforadatabasecreatedforaspecificapplicationoflimitedscope.Thisguidepresentsalistingofthedataelementsanddoesnotintendtodefineanysingleorganizationofthedataelementstobeusedineitheralogicalorphysicalmodelforthedatabase.Thedataelementlistsaredividedbygroupheadingsfordiscussionpurposesonly.Thegroupheadingsarenotintendedtoidentifynormalizationof......
【中国标准分类号】:H07
【国际标准分类号】:77_120_01
【页数】:9P.;A4
【正文语种】:英语